. >> general david petraeus hands over command of american and coalition forces in afghanistan to general john allen. transferring responsibility for the nearly ten-year war. general allen saying he will support the campaign to draw down u.s. forces and transition some areas to afghan control but acknowledges that it will not be easy. >> there will be tough days ahead. and i have no illusions about the challenges we will face. challenges we will face together. >> generalá6 petraeus who commanded international forces in afghanistan for one year is retiring from the military, to become the director of the central intelligence agencagenc. >>> an extreme heat wave is spreading across the country. heat advisories and warnings in place from texas to michigan as temperatures and humidity send the heat index soaring into triple digits in areas. the blistering heat is expected to move east. with no end in sight, cities are opening cooling centers and warning residents to be aware of signs of heatstroke. >>> harry potter cast its biggest spell yet on movie sw goers. the eighth andá final part sha